DISCUSSION 
TaBLE I1—Showing the values of S and Ho 
for each third of a month, and also of Bo, 
as affected by the annual inequality, and 
the constants of the equations. 
Date. SS) Hy Bo 
Ft. It. d.h. m. 
Jan. 1 0. 92 20. 09 123 9.0 
cut 0. 93 20. 07 9.1 
21 0.95 20. 04 9.3 
Feb. 1 0.97 20. 00 9.6 
WW 1.00 19. 96 10.0 
21 1.02 19. 96 10.5 
Mar. 1 1.03 19. 98 11.0 
11 1.03 20. 01 11.6 
a1 1. 02 20. 03 12.3 
| 
April 1 1.01 20. 06 13.0 | 
11 1.00 20. 08 13.7 
Q1 0.97 20.11 14.4 
May 1 0.93 20. 14 15.0 
1 0.90 20. 15 15.5 
a1 0. 87 20.16 15.9 
r 
June 1 0.84 | 20.16 16.3 
ol 0. 83 20.16 16.6 | 
| a1| O81 | 20.16 16.9 
| 
| July 1 0. 82 20.17 17.0 
} U1 0. 83 20.17 16.9 
21 0. 86 20. 18 16.6 
Aug. 1 0. 89 20. 20 16.3 
11 0. 92 20. 21 15.9 
21 0.95 20. 21 15.5 
Sept. 1 0.98 20. 22 15.0 
11 . 00 20. 23 14.4 
21 1.01 20. 25 1387 
Oct. 1 1.01 20. 27 13.0 
11 1.01 20. 29 12.3 
21 1.00 20. 30 11.6 
Nov. 1 0.98 20. 31 11.0 
maT 0.96 20. 31 10.5 
21 0.94 20. 30 10.0 
Dec. 1 0. 92 20. 27 9.6 
11 0.91 20. 22 9.3 
21 0. 92 20. 16 123 9.1 
Nore.—For the value of Hy above mean low 
water, subtract 15. 26 feet. 
7* 
OF TIDES IN 
TABLE II1—Showing the inequalities resulting from friction and 
other causes, and depending upon the moon’s transit, parallax, and 
BOSTON 
HARBOR. 
declination. 
D's transit. | “Equation. yee Equation. | D’sdec. | Equation. 
| | 
h. m. m | & @ mM. © m. 
0 00 80), |) 54" 00 15.0 0 0.0 
30 | 78 | 30 14.0 2 0.1 
1 00 500) 13.0 4 0.2 
30 69 | 30 12.0 6 0.4 
2 00 6.0 56 00 11.0 8 0.6 
30 5.0 30 10.0 10 0.9 
3 00 4.0 57 00 9.0 12 1.2 
30 3.0 30 8.0 14 1.6 
4 00 OXON al e589 00. 7.0 16 2.0 
30 ii | 30 6.0 18 2.5 
| 8 @ 0.5 59 00 5.0 20 3.0 
30 0.2 30 4.0 22 3.6 
6 00 0.0 60 00 3.0 24 4.3 
30 0.2 30 9.0 26 5.1 
7 00 0.5 61 00 1-9 28 6.0 
30 it || 30 0-9 30 7.0 
8 00 20 | 
30 30 | 
9 00 4.0 
30 5.0 
| 10 00 6.0 
30 6.9 | Constant ..-.9m.0 Constant. ... 2m.0 
11 00 Tha” 
30 7.8 
Constant ....4m. 0 
TaBLE 1V—Showing the effect of the moon’s diwrnal tide upon the 
‘times and heights, and also of the term depending upon the fourth . 
power of the moon’s distance, contained in the last columns. 
argument is D, taken one day in advance. 
The 
D's dee. Equations of high | Equations of low Equations of 
water. water. semi-diurnal tide. 
° mM. Ft. mM. It. m. Ft. 
+30 3.0 +0. 63 13.0 —0. 37 0.0 0. 06 
20 25 0. 53 2.5 0. 32 0.3 0. 06 
20 2.0 0. 43 220) 0. 26 0.8 0. 05 
15 1.5 0. 32 1.5 0. 20 1.4 0. 05 
10 1.0 0, 22 1.0 0.13 1.9 0. 04 
+5 —0.5 +0. 11 +0.5 —0. 07 2.5 0. 04 
0 0.0 0. 00 0.0 0. 00 3.0 0. 03 
—5 +0.5 —0.11 —0.5 +0. 07 3.5 0. 02 
10 1.0 0.22 1.0 0.13 4.1 0. 02 
15 Aso) 0. 32 1.5 0. 20 4.6 0. 01 
20 2.0 0. 43 2.0 0. 26 5. 2 0. 01 
20 2.5 0. 53 255) 0, 32 5.7 0. 00 
—30 +3. 0 —0. 63 —3.0 +0. 37 6.0 0. 00 
Notre.—For lower transits the signs of the diurnal tide must be reversed, 
49 
